Puppy 525, 510, 421 do not detect any ethernet interfaces using the on-board Broadcom ethernet (wired) adapter in my new Dell Inspiron 570. Based on the driver used by the pre-installed Windows7, the adapter should use the latest Broadom drivers for their NetLink 57xx adapters. This includes the tg3 driver for Linux. Using the network setup wizard, I have tried re-loading the tg3 driver (which I think was already loaded) as well as trying the NDIS wrapper with several windows drivers downloaded from Broadcom. With the NDIS wrapper, I do get "k57win32: driver installed, device(14E4:1691) present", however the ultimate result is still "No new interfaces detected".

Other than buying/installing a pci ethernet card, I do not know what to try next.
Any help is appreciated.

I've run into a broadcom issue as well FatPuppy64-520b3 identified and made usable from default install, also there is a delta patch for Lup525 to add the usability.
Based on your download speed and patch skills

try either search forum for
lupu-520.iso___lupu-520_bcmwlmod.iso.delta
or
Fatdog64-520b3.iso

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